Mower



MOWER. APPLICATION FlLEDDEC.24, 1915.

Patented Dec. 6, 1921.

2 $HEETS-SHEET I- J. G. FAHR.

MOWER. APPLICATION FILED uc.24. 19w.

Patented Dec. 6, 1921.

2 SHEETS-SHEET 2- barren starts variant JOHANN GEURG'r FAHR, 0F GQTJUMADINGEN, GrElRll'IANY, ASSIGN'UB TU MASCHINEN- FABRIK FILER A.-Gr., OLE GOTTMADINGEN, GEJEWIAIQIY.

IWUWER.

rename.

Specification of Letters Patent.

li e/tented Deco h, 192i.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF lltlfllitlllil 3, 1921, ll STAT. L, 1313.)

To all whom it may concern:

lie it known that 1, Johann Gnono harm, a citizen of the Empire of Germany, resld ing at Gottmadingen, in the @rrand-duchy sition.

A. primary object is to provide a machne of the type described in which the cutting mechanism is swung into the vertical position solely by a treadle operated by the driver in one single operation. According to the invention the treadle lever is mounted and connected with the lifting mechanism in such a manner that the treadle remains equally readily within reach of the foot of the seated driver during the entire path traversed by it during the rocking opera tion and that the force required to be exercised at any time by the foot does not exceed the normal muscular force of the driver. This end can be attained by suitably propon tioning the lengths of the lever arms but it is preferably attained, as in the embodiment described herein after by inserting an intermediate transmission mechan'sm which produces a relatively large angular movement of the arm of the lifting lever when the treadle lever moves through a relatively small an gle. in this manner the treadle can be kept during its entire movement within such a distance of the drivers seat that the drivers foot is able to exercise on the treadle during this movement a maximum force which sufiices for rocking the cutting mechanism into the vertical position. The arrangement is particularly suitable when toothed wheel gearing having internal toothing is employed as the transmission mechanism, an in ternally toothed gear member of larger diameter being connected with the treadle lever and an externally toothed gear member of small. diameter being connected with the lifting lever. TlllS arrangement results in a longitudinally compact construction which is particularly desirable for such machines.

.ment of the movement to the end with an approximately constant force.

To these ends the invention consists in the construction arrangement and combination of parts described hereinafter and pointed out in the claims.

Une illustrative embodiment of the invention and modification thereof are represented by way of enample in the accompanying drawing, whereln Figures 1 and 2 are side elevations showing one form of the improved mechanism in two different positions, and

Figs, 3 and 4: are like views of another form provided with intermediate gearing comprising gear wheels having external toothing.

lln both forms the cutting mechanism can be lifted in known manner to a middle height, c, swath height, and be held at this elevation. Figs. 1 and 3 show the devices when the cutting mechanism is in its lowest position the position of the parts after the cutting mechanism has been lifted to the swath height being indicated in dotted lines. FigsQ and i show the position of the parts after the cutting mechanism has been rocked into its vertical position.

Referring to Figs. 1 and 2, the treadle lever 1) which is fulcrumed at a and carries thefoot bar 0 has a rearwardly directed arm (Z connected with the spring 6 and carries the known pawl f which normally takes into one of the notches g in the frame a depending on the position of the cutting mechanism and can be disengaged by the treadle a, b. lhe lever b is rigidly connected with an internal toothed sector it which meshes with an external toothed sector 71 of smaller radius Which is mounted in the frame and is rigidly connected with the lifting lever-arm is proper. The cutting mechanism 9 is suspended from the latter in known manner by means of the rod Z. In Fig. 1 the treadle lever 12 is shown in full lines in its initial position in which it is located relatively to the drivers seat m so that it can be conveniently reached by the drivers foot, and when it'is depressed into the position shown in Fig. 1 in dotted lines or further into its lowest position shown in Fig. 2, it can be readily reached from the drivers seat throughout its travel. Its movement is transmitted by the gearing h, ito the lifting arm k, so that the latter turns through a larger angle and in spite of the relatively short distance moved through by the treadle, moves upward so far that when it is in its highest position, shown in Fig. 2, the cutting mechanism arrives in known manner into its vertical position.

. The device shown in Figs. 3 and 4 operates in the same manner as that shown in Fig. 1, the-only difference between the two forms being the substitution of the described gear-ring having internal teeth by a sector n having external teeth, the rotation of which is imparted by means of an intermediate'gear wheel 0 to the pinion p fast on the lifting lever 70. i

In both the forms described above the lifting space 6 is arranged in such a manner that it tends to depress the treadle b, from the beginning of the movement until the'end of the same, and the angle between the axis of the spring 6 and the rearwardly directed arm d of the treadle lever b is smallest when the cutting mechanism is located at the ground (Figs. 1 and 3) and increases as the treadle lever Z) is rocked downward. In the position of the parts shown in Figs. 1 and 3 the spring 6 is tensioned most,

so that its pull is then a maximum. Consequently, the turning moment acting on the lever b is very considerable in spite of the small vertical distance of the axis of the spring fromthe fulcrum (1. Owing to this distance increasing when the lever b is moved downward, while the pull of the spring e, on the other hand, decreases, the turning moment exercised by the spring (1 on the lever Z) during its entire travel is approximately equal, so that the assistance rendered to the driver by the spring is constant, and by suitably selecting the spring cised by the driver never exceeds the ad missible amount. It will of course be understood that the spring 6 must be more powerful, the heavier the cutting apparatus of the mower or the like is.

I claim A mower including a frame, a cutter secured thereto, a treadle attached to said frame provided with a rearwardly extend ing arm, a spring having one end connected to the rear end of said arm and its other end connected to the front of the frame, and transmission means extending between the treadle and cutter, whereby when the treadle is operated the transmission means operate to lift the cutter bars into vertical position in a single step, the treadle being at all times within easy reach of the foot of the operator. In testimony whereof I aflix my signature in presence of two witnesses.

J OHANN GEORG FAHR. lVitnesses:

OTTO A. MERMONN, C. INNESS Brown.

it can be arranged that the force to be exer- 

